【摘要】 研究了ＮＯ－２ 离子在ＴｉＯ２ 表面的光催化反应． 结果表明，体系ｐＨ值升高及Ｃｒ（ Ⅵ） ，Ｃｌ－ ，ＳＯ２ －４ 离子的加入均对ＮＯ－２ 离子在ＴｉＯ２ 表面的暗态吸附产生抑制作用，而ＮＯ－２ 在ＴｉＯ２ 表面的光照反应转化率则随ｐＨ值的升高出现先减小后增大的总体变化趋势．ＳＯ２ －４ 对反应具有明显的协同作用．Ｃｒ（Ⅵ） 在强酸性条件下促进反应，ｐＨ＞ ５ 时则抑制反应进行．Ｃｌ－ 对反应具有一定的抑制作用，但与Ｃｒ（Ⅵ） 共存时，二者对反应的抑制作用明显减弱． 该反应具有比较特别的动力学规律，反应为零级反应，但反应速率却与ＮＯ－２ 的初始浓度相关．更多还原

【Abstract】 Photocatalytic reaction of NO - 2 with TiO 2 semiconductor has been studied. The results show that the adsorption of NO - 2 ion on TiO 2 in dark condition is inhibited in the presence of OH -, Cr(Ⅵ), Cl - and SO 2- 4, but the conversion of NO - 2 ion for the photocatalytic reaction is increased and then decreased with the increase of pH. SO 2- 4 ion has a promotion effect on the reaction. Cr(Ⅵ) promotes the reaction in strong acid solution, but inhibits the reaction when pH>5. Cl - ion exhibits an inhibition effect on the reaction, but the effect is reduced in the presence of Cr(Ⅵ). The reaction exhibits zero order reaction character of kinetics. It is interested that the velocity of reaction changed with initial concentration of NO - 2 ion.更多还原